<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<style>
    *{
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }
    body{
        width: 100vw;
        height: 100vh;
        display: flex;
        justify-content: center;
        background-color: #00a8ff;
    }
    #water{
        margin-top: 200px;
        width: 300px;
        height: 300px;
        border-radius: 59% 41% 63% 37% / 22% 26% 74% 78%;
        box-shadow: inset 10px 20px 30px rgba(0, 0, 0, 0.5),
                    10px 10px 20px rgba(0, 0, 0, 0.3),
                    15px 15px 30px rgba(0, 0, 0, 0.05),
                    inset -15px -15px 15px rgba(255, 255, 255, 0.5);
        animation: action 3s linear infinite alternate;
    }
    #water::before{
        content: '';
        width: 10px;
        height: 10px;
        position: absolute;
        top: 265px;
        left: 48%;
        background-color: rgba(255, 255, 255, .8);
        border-radius: 50% 50% 63% 37% / 54% 63% 37% 46%;
    }
    #water::after{
        content:'';
        width: 20px;
        height: 20px;
        position: absolute;
        top: 240px;
        left: 45%;
        background-color: rgba(255, 255, 255, .8);
        border-radius: 50% 50% 63% 37% / 54% 63% 37% 46%;

    }
    @keyframes action {
        25%{
            border-radius: 30% 70% 44% 56% / 42% 26% 74% 58%;
        }
        50%{
            border-radius: 30% 70% 21% 79% / 57% 26% 74% 43%;
        }
        100%{
            border-radius: 30% 70% 51% 49% / 33% 40% 60% 67%;
        }
        
    }
</style>
<body>

    <div id="water"></div>
    
</body>
</html>